Consensus phylogenetic tree of the portal gene from both sequenced phages and phages isolated from different geographical locations.

<p>Group 1, Group 2 and database phage sequences as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0002048#pone-0002048-g002" target="_blank">Figures 2</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0002048#pone-0002048-g003" target="_blank">3</a>. The non-<i>mazG</i> group, RS60, RS84, RS76, S-IO8, 1048, RS22, IO25 and IO12 comprise phage sequences for which our primers failed to detect <i>mazG.</i> Trees are unrooted and were generated from DNA codon alignments. Clade support values are shown at the nodes of the clades, only values below 0.95 are shown. Group 1 and Group 2 phage are coloured red and green respectively with phage sequences from NCBI in orange, as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0002048#pone-0002048-g003" target="_blank">Figure 3</a>. The non-<i>mazG</i> phage group are coloured black.